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← ScienceWhich consequence results when the Thiele modulus exceeds unity in a catalyst pellet?
A)Rate becomes diffusion limited✓
B)Uniform catalyst bed temperature
C)Maximum internal surface area
D)Intrinsic reaction rate dominates
💡 Explanation
When the Thiele modulus is greater than one, internal diffusion limitations are significant, because the reaction rate is faster than the diffusion rate of reactants into the catalyst. Therefore, the rate becomes diffusion limited, rather than controlled by chemical kinetics alone.
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